Injector.



INJEGTOR.

2 SHEETS-SHEET 1.

Iliff/l APPLIOATIOAN FILED APR. Z7. 1.906.

WTNESSES:

- www No. 857,882. PATENTED JUNE 25, 1907.

S. L. KNEASS.

I-NJEGTOR.

APPLICATION FILED APR.27. 1906. 2 SHEETS SEEBT 2.

1HE nomas PETERS co., wAsHlNaroN, D. c.

`UNITED STATES PATENT OFFICE.

STRICKLAND L. KNEASS, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO VILLIAM-SELLERS @c COMPANY, INCORPORATED, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

lNuEo-ron.

Specification of Letters Patent.

Patented June 25, 1907.

Application filed April 27,1906. Serial N0. 313,939

To all whom it may concern:

Be itlrnown that I, S'rnrcKLAND L. KNEAss, a citizen of the United States, residing at Philadelphia, county of Philadelphia, and State of Pennsylvania, have invented a new and useful Improvement in Injectors, of which the following is a full, clear, and eXact description, reference being had to the accompanying drawings, which form a part of this specification.

In certain forms of steam injectors for feeding boilers, there is a port between a water supply and an overflow chamber, which port is controlled by a valve which opens when there is a vacuum, or partial vacuum in the overflow chamber, and when that vacuum or partial vacuum is less than the partial vacuum in the water supply chamber, the valve seats.

My improvement has for its object to make the closure of the port between the water supply and over-flow chamber certain under conditions of operation ywhich require such closing, so that practically nothing will prevent the proper action of the injector. Moreover, if, for any cause, the valve fails to start by its normal action, the steam in the overflow chamber will act upon a supplemental valve and cause it to close.

In my arrangement, the injector, including a port between a water supply and an overflow chamber, is provided with a casing containing` a duplex check valve controlling said port, so that in case one valve fails to seat, the other will. independent` elements. In my Ispecific embodiment, there is a main check valve, and a supplemental check valve, each movable independent of the other so that one may seat fully, though the other may fail to do so. I also dish or curve the face of the main inlet check valve so that steam passing, or tending to pass, from the overflow chamber toward the water supply and passing between these valves, will act on this face as an abutmentand cause the supplemental valve to move and seat. This will produce a certainty of the closing of the port between the water supply and an overliow chamber if there be an otherwise sluggish movement of the main inlet check valve, or tendency not to move.

I will now describe the embodiment of my This valve is composed of lin this port.

invention as illustrated in the accompanying drawings:

In the drawings: Figure 1 is a longitudinal section through an injector. Fig. 2 is a modiiied form of same. Eig. 3 is a section through inlet valve. Fig. I is a cross section of same on line 4 4. Fig. 5 is a section of a modiiied form of inlet valve. Fig. 6 is a cross section of same on line 6 6.

A is the body or casing of the injector provided with branches B for the water supply, and E for the steam inlet, the branch for the delivery connection not being shown. The casing A is divided by the septum G Cr into two chambers. The chamber B for the water supply, which communicates with the water branch B, the other chamber, the overflow chamber D, which contains the receiving end 1).of the forcing combining tube b and its apertures.

a is the forcing steam nozzle and a is the lifting steam nozzle.

b is the forcing combining tube provided with the apertures CZ and d.

t is the combining tube of the lifting set and Olm the aperture between the combining tube of the lifting set and the receiving end of the forcing combining tube.

c is the delivery tube through which the jet passes into the boiler feed pipe.

d is the` outlet port from the overflow chamber D, controlled by the gravity check valve.

f is a port connecting the water supply and the over-flow chamber D. 7L is a casing In this casing is the septum t.

is a check valve secured to the end of rod k, which passes through the orifice in guide Z (Figs. 3 and 5) which is secured to casing 72, by arms m. The other end of this rod iis threaded and a nut n thereon limits the extent of movement of rod 7 and thus of valve j. The valve j (Fig. 3) is also provided with the projecting guides o. Loose upon this rod 7c is the supplemental check valve t which seats upon the septum i, independent of the seating of valve j. The under surface of valvey' is made slightly dish plemental valve p is made slightly convex, and a hub Z holds the valve p away from contact with valve j.

IOO shape or concave while the face of the sup- The valvesj and p are moved to open the passage, in the ordinary way, by the vacuum or partial vacuum in the over-How chamber. When this vacuum or partial vacuum is relieved,andthe valves start to seat, due to the partial vacuum in the water supply chamber, if 'for any reason the valve j failed to seat upon the casing, the valve p, being independent thereof, will seat upon the se tuin and close the port. In like manner, if t e supplemental valve p fails to slide upon the stem lc and seat upon the septum, the main valve will seat upon the casing and close the port. If for any reason the valves fail to move to seat, by the excess of pressure in the overiiow chamber, over that in the water supply chamber the steam from the overiiow chamber passing between the two valves will react upon the lower face of valve and against face of valve p to seat it, closing the port.

In Figs. 5 and 6 I have shown a modiiied form of duplex check valve including casing and valves. In this construction, the rod is secured to the casing, and both valves j and p are loose thereon, the end of the rod being threaded and on which threaded end a nut works, limiting the movement of the valves. In both constructions, each valve and p are movable independent of the other, each has its seat and each closes or controls the port. Hence, when either is seated, the port is closed. Moreover, in both constructions in case of a failure to move to close, the steam from the overfiow chamber will react between the two valves to force the lower valve to close.

In Fig. 2 the outlet port d from the overiiow chamber D is not shown, the said port being in the overiiow chamber at a point beyond that shown in the drawings.

Having now fully described my invention, what I claim and desire to protect by Letters Patent is:

1. In an injector, including a port between a water supply and an overflow chamber, a casing comprising two independent valve seats, a main check valve adapted to one seat, a supplemental valve adapted to the other seat, said valves together and separately controlling said port, both the main and the supplemental valves, in the open position, being in the overflow chamber.

2. In an injector, including a port between a water supply and an overflow chamber, a casing containing a stem, a check valve and a supplemental valve, one of said valves being connected to said stem, the other movable separately controlling said port.

3. In an injector, including a port between a water supply and an overflow chamber, a casing containing a stem, a check valve and a supplemental valve, the stem guiding both the check valve and supplemental valve, said valves together and separately controlling said port.

4. In an injector, including a port between a water supply and an overflow chamber, a casing having two independent seats, a main check valve adapted to one seat, and a sup plemental check valve adapted to the other seat, said valves together and separately controlling said port, the surface of the main check valve adjacent to the supplemental valve being dished,

5. In an injector, including a port between a water supply and an overflow chamber, a casing having two independent seats, a main check valve adapted to one seat, and a supplemental check valve adapted to the other seat, said valves together and separately controlling said port, the surface of the main check valve adjacent to the supplemental valve being dished, and means to prevent the supplemental valve contacting directly with the main check valve.

6. In an injector, including a port between a water supply and an overflow chamber, a casing containing a stem guiding a check valve, and a supplemental valve, the casing having two independent seats, one for each valve, said valves together and separately controlling said port.

7. In an injector, including a port between a water supply and an overflow chamber, a casing, a stem guiding a check valve and a supplemental valve, the surface of the check valve adjacent to the supplemental valve being dished, the casing having two independent seats, one for each valve, said. valves together and separately controlling said port.

8. In an injector, including a port between a water supply and an overiiow chamber, a casing, a stem guiding a check valve and a supplemental valve, the surface of the check valve adjacent to the supplemental valve being dished, and means to prevent the supplemental 'valve contacting directly with the check valve, the casing having two independent seats, one for each valve, said valves together and separately controlling said port.

In testimony of which invention, I have hereunto set my hand, at Philadelphia, on this 26th day of April, 1906.

STRICKLAND L. KNEASS. Witnesses:

JOHN L. PniLLIPs, E. R. HARPER.

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